CN113890167A - General type short-time backup power circuit - Google Patents
General type short-time backup power circuit Download PDFInfo
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- CN113890167A CN113890167A CN202110871290.7A CN202110871290A CN113890167A CN 113890167 A CN113890167 A CN 113890167A CN 202110871290 A CN202110871290 A CN 202110871290A CN 113890167 A CN113890167 A CN 113890167A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a universal short-time backup power supply circuit, which comprises a first switch, a charging circuit, an energy storage device, a second switch, a discharging circuit and a main control module, wherein the charging circuit is connected with the energy storage device; the power supply is connected with a charging circuit through a first switch, and the charging circuit is connected with the energy storage device; the energy storage device is connected with the charging circuit through a second switch; the first switch is also connected with the discharge circuit through a power supply bypass; the discharging circuit supplies power to the electric equipment and the main control module. The invention realizes the charge and discharge management of the super capacitor, the stable output of the discharge circuit and the maximum utilization of the capacity of the super capacitor; for a general short-time power-down protection device, the universal replacement is more suitable, so that the cost and the performance are more advantageous.
Description
Technical Field
The invention belongs to the technical field of backup power supply, and relates to a universal short-time backup power circuit.
Background
Along with the application development of the Internet of things, more and more Internet of things equipment need to use a backup power supply, and the working can be kept after the mains supply is powered off. The general solution is to use the traditional lithium battery backup power supply scheme, and the application scheme is mature. However, the backup power supply scheme of the lithium battery has high cost and small applicable working environment range, and is generally only suitable for working at the environmental temperature of 0-45 ℃; for the application occasions of the Internet of things, a plurality of devices are industrial-grade use environments and are required to be installed in outdoor environments, the temperature of minus 40 ℃ to 60 ℃ generally must be met, and the lithium battery cannot adapt to the working environment, so that the capacity of the lithium battery is rapidly reduced and the service life of the lithium battery is shortened; the common solution is to heat or temperature compensate the lithium battery, but this adds cost and complexity to the application. Therefore, the conventional lithium battery backup scheme has a great defect.
The super capacitor is used as a backup power circuit for replacing a traditional lithium battery, the application occasion of a general short-time backup power can be met, the capacity of the super capacitor is weaker than the backup power capacity of the lithium battery, but the working environment temperature application range of the super capacitor is wide, and the super capacitor has natural advantages for low-power-consumption Internet of things equipment. And has advantages over lithium batteries in terms of cost.
The patent publication No. CN 111416414A discloses a charging and discharging control system of a super capacitor and a charging and discharging control circuit thereof. The defects are as follows: 1) the super capacitor of the energy storage device cannot judge whether charging is completed or not, and needs to use VIN for charging all the time. Therefore, the super capacitor is always in a continuous charging and discharging state, and the service life of the super capacitor can be shortened. 2) The load resistor R1 is used as a current-limiting charging circuit, so that the charging efficiency is low, the circuit needs to be designed to dissipate heat of the load resistor R1, and the cost is increased. 3) The discharge circuit is only a simple MOS switch, so that the backup power supply can only be reduced along with the reduction of the voltage of the super capacitor, the output voltage is unstable, and the requirement of a universal backup power supply circuit is not met; and this results in poor efficiency of energy storage utilization of the super capacitor.
The invention patent with publication number CN 104578366B discloses a self-powered super capacitor energy storage power supply for line fault detection. The defects are as follows: 1) the capacitor is directly connected to the super capacitor, so that the surge current is large, and the super capacitor is easy to damage; and the power supply is unstable at the moment of power-on and startup. 2) The discharge circuit is a simple MOS switch, so that the backup power supply can only be reduced along with the reduction of the voltage of the super capacitor, and the output voltage is unstable. 3) The power supply system is lack of logic control of shutdown, and can be shut down only by depending on the power consumption of the super capacitor, and thus, when the power supply voltage critical value is shut down, equipment can be continuously started and shut down, and equipment faults are easily caused.
Utility model patent with publication number CN 208190326U discloses a short-time backup power circuit. The defects are as follows: 1) although surge current is reduced by using the special hot plug controller chip LTC4218, the cost price of the chip is too high, and the chip is not cost-effective. 2) The special buck-boost control chip LTC3110 is used for charge and discharge management of the super capacitor, the cost price of the chip is too high, cost performance is not achieved, and the universality is not achieved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a universal short-time backup power circuit, which realizes the charge and discharge management of a super capacitor, the stable output of a discharge circuit and the maximum utilization of the capacity of the super capacitor.
The invention is realized by the following technical scheme:
a universal short-time backup power supply circuit comprises a first switch, a charging circuit, an energy storage device, a second switch, a discharging circuit and a main control module;
the power supply is connected with a charging circuit through a first switch, and the charging circuit is connected with the energy storage device; the energy storage device is connected with the charging circuit through a second switch; the first switch is also connected with the discharge circuit through a power supply bypass; the discharge circuit supplies power to the electric equipment and the main control module;
the first switch and the second switch are mutually exclusive switches; when the power supply supplies power normally, the first switch is switched on, and the second switch is switched off; when the power supply is powered down, the first switch is turned off, and the second switch is turned on;
the input signals received by the main control module comprise power failure detection signals and voltage detection signals of the energy storage device, and the signal output comprises charging enable for controlling the conduction of the charging circuit and discharging enable for controlling the conduction of the second switch;
the charging enable is output after a power failure detection signal pin and a voltage control pin of the energy storage device are connected with a switch through logic by a main control module; the charging enable is sent out when the power supply detects that electricity exists and the voltage of the energy storage device is lower than a threshold value, and the charging circuit is conducted to charge the energy storage device;
when the power supply is powered off, the energy storage device supplies power to the discharge circuit through the second switch, and the discharge enable keeps the second switch conducted; when the power consumption equipment is powered off, the discharging enable controls the second switch to be switched off.
The first switch comprises a path switch and a control switch, the control switch is conducted when the power supply is normal, and the path switch is conducted; the control switch is turned off when the power supply is powered off, and the path switch is turned off;
the second switch comprises a third switch and a fourth switch which are connected in series, and two sides of the third switch are also connected with a diode in parallel; the third switch and the first switch are mutually exclusive, and the fourth switch is controlled by the main control module;
the fourth switch is conducted by default, and the energy storage device can supply power to the discharge circuit through the diode at the moment of power failure of the power supply; after the third switch is conducted, the energy storage device supplies power to the discharge circuit through the third switch and the fourth switch;
the main control module controls the fourth switch to be switched on, and then the power supply can be cut off.
The charging control of the energy storage device by the main control module is as follows:
the main control module carries out power failure detection in real time and collects the voltage of the energy storage device at regular time; if the received power supply power failure detection signal is electrified and the received voltage detection signal of the energy storage device is lower than the threshold voltage, the logic and switch is conducted, the charging enable is sent out, and the switch in the charging circuit is opened to charge the energy storage device; if the detected voltage of the super capacitor is not smaller than the threshold value, the logic and switch is not conducted, and the charging circuit is closed.
The main control module controls the discharge of the energy storage device as follows:
the master control module defaults that the fourth switch is kept on;
if the received power failure detection signal is power failure, the fourth switch is kept to be conducted by discharging enable;
the main control module also implements the following power-down protection strategies after power failure:
estimating the current SOC electric quantity according to the voltage of the energy storage device, estimating the power supply time of a backup power supply by combining the current of the electric equipment, and reporting a warning, prompting and/or performing low power consumption setting to the electric equipment; when the voltage of the energy storage device is lower than the threshold value, prompting the electric equipment to prepare for power failure;
when the electric equipment is shut down, the fourth switch is closed by controlling the discharging enable, and the power supply to the discharging circuit is cut off.
An RC delay circuit is arranged between the signal end of the discharge circuit and the first switch/the second switch and is also connected with the main control module through a bleeder circuit; the main control module is also conducted through the reset enabling control bleeder circuit to carry out hardware power-on reset control:
when the power failure detection signal is power, the main control module sends out reset to conduct the bleeder circuit, the level of the signal end of the discharge circuit changes, the discharge circuit is closed, and the whole circuit is powered down; after the main control module is powered off, the output reset enable is changed into a low level, the bleeder circuit is closed, after the power supply is powered on through the RC delay circuit, the level of the signal end of the discharge circuit is recovered, the discharge circuit works again, and the power supply is recovered to be normal.
The RC time delay circuit ensures that the discharge circuit is enabled under the condition that the power supply is electrified, and the power supply supplies power to the electric equipment through the first switch and the discharge circuit;
the power-down duration in power-on reset can be configured and adjusted through the resistance value and the capacitance value of the RC delay circuit.
The energy storage device is a super capacitor, the fourth switch is kept conducted by default in the main control module, the third switch is connected with a diode in parallel, and the super capacitor can supply power to the discharge circuit through the diode at the moment of power failure;
after power failure, the third switch is opened, the first switch is turned off, the main control module detects a power failure signal of the power supply, the fourth switch is kept on, and the super capacitor is ensured to supply power to the charging circuit;
the charging circuit is a current-limiting circuit or a current-limiting chip; the discharging circuit is a booster circuit or a booster chip;
the threshold voltage does not exceed the rated voltage of the energy storage device.
The first switch comprises a PMOS transistor VT1 and an NMOS transistor VT2, and the source electrode of VT1 is connected with the positive electrode of the power supply; the positive electrode of the power supply is connected with the grid electrode of the VT2 through a voltage dividing resistor, the source electrode of the VT2 is grounded, and the drain electrode of the VT2 is connected with the grid electrode of the VT 1; the drain of the VT1 is respectively connected with the charging circuit and the discharging circuit; the VT2 is conducted when the power supply is normally powered, and the VT1 is conducted; VT2 is turned off when power is off, and VT1 is turned off;
the charging circuit is a current-limiting chip D1, the current-limiting chip D1 is connected with the first switch through a voltage-dividing resistor, and a signal end of the current-limiting chip D1 is connected to an IO pin of the main control module and receives a charging enabling signal EN _1 of the main control module;
the energy storage device is a super capacitor C1, the anode of the energy storage device is respectively connected with the output end of the charging circuit and the second switch, and the cathode of the energy storage device is grounded; the super capacitor C1 is connected with an AD acquisition pin of the main control module, so that the main control module can acquire voltage signals of the main control module;
the second switch comprises a pair of back-to-back PMOS tubes VT3 and VT 5;
the VT3 is a third switch, the source is connected with the output end of the charging circuit, the drain is connected with the drain of the VT5, the grid is connected with the PNP triode VT4 which is controlled and conducted by the power source in the reverse phase; the base electrode of the VT4 is connected with the positive electrode of the power supply through a divider resistor, the collector electrode is grounded through a resistor, and the emitter electrode is connected with the grid electrode of the VT 3; VT3 implements hardware mutual exclusion with the first switch via VT 4; a parasitic diode between the source and drain of VT3, implementing a diode in parallel with the third switch;
the VT5 is a fourth switch, the grid electrode of which is connected with the drain electrode of the NMOS tube VT6, and the source electrode is connected with the discharge circuit; the source of the VT6 is grounded, the gate is connected to the IO pin of the main control module, and the VT6 receives the discharge enable signal EN _2 sent by the active module, thereby implementing the conduction control of the main control module on the VT 5.
The discharging circuit is a DC/DC boosting chip D2, and the input end of the discharging circuit is connected with the first switch and the second switch; the delay circuit comprises a first RC delay circuit formed by a resistor R12 and a capacitor C4, and a second RC delay circuit formed by a resistor R14 and a capacitor C5; the resistor R12 and the capacitor C4 are connected between the input power supply and the ground, and the resistor R14 and the capacitor C5 are connected between the master control module and the ground;
the bleeder circuit comprises an NMOS transistor VT7 and a resistor R13, wherein the source electrode of the NMOS transistor VT7 is connected with the resistor R12 through the resistor R13 and is connected with the signal end of the D1; the resistor R13 and the NMOS tube VT7 can discharge the level of the first RC circuit, so that the enabling of the discharge circuit is controllable; the drain of the VT7 is grounded, the gate of the VT7 is connected to the resistor R14 through the resistor R15, the other end of the resistor R14 is connected to the IO pin of the main control module, and receives the reset enable signal EN _3 to control the turn-on and turn-off of the VT7, so as to control the enable or disable of the discharge circuit.
The main control module is an MCU D3 integrated with a crystal oscillator circuit inside, and a power supply part of the main control module comprises a power supply circuit and a power-on reset circuit; the power supply circuit comprises power supply filter capacitors C22 and C23 which are connected to a power supply pin of the MCU D3; the power-on reset circuit comprises a resistor R21 and a capacitor C21 which are connected to an NRST pin of the MCU D3 and form an RC circuit of the power-on reset;
the resistors R22 and R23 form a voltage division circuit for power input, are connected to a PB0 pin of the MCU D3 and are used as input signals for power failure detection of the main control module;
the resistors R24 and R25 form voltage division input of a super capacitor, are connected to a PB1 pin of the MCU D3 and are AD input signals for the master control module to collect the voltage of the energy storage device;
a PC4 pin of the MCU D3 is used as a charging enable pin and outputs a charging enable signal EN _ 1;
a PC1 pin of the MCU D3 is used as a discharge enabling pin and outputs a discharge enabling signal EN _ 2;
the pin PC0 of the MCU D3 serves as a power-down reset pin and outputs a reset enable signal EN _ 3.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, through voltage acquisition and power failure detection of the energy storage device (super capacitor), and effective management of charging of the super capacitor is carried out through the logic and control strategy of the main control module, on one hand, the voltage of the super capacitor is ensured, and the electric quantity of a backup power supply is ensured; meanwhile, the overuse of the super capacitor is avoided, and the service life of the super capacitor is ensured; the voltage of the output power supply is ensured to be stable by performing boosting treatment through the discharge circuit, and the energy storage capacity of the super capacitor is fully and effectively utilized;
the invention increases and perfects the shutdown control of the backup power circuit, ensures the universal applicability and the cost performance of the circuit, ensures that the power supply has no critical shutdown voltage state, and avoids the continuous startup and shutdown of equipment, thereby easily causing equipment failure. Meanwhile, through the delay circuit, the bleeder circuit and the reset enabling control of the main control module, under the condition of normal power supply, the function of resetting the hardware after power failure and power on again is realized, and the reliability is higher than that of the traditional software reset. Furthermore, the voltage of the energy storage device can be monitored in real time, the SOC capacity of the energy storage device is estimated, and strategy management can be performed according to the capacity; automatic power-down and power-up switching of charging and discharging is carried out; and the backup power supply can be controlled to be shut down through discharging enable according to the requirement of the master control.
The invention can use a general super capacitor as a short-time energy storage device, thereby replacing the traditional lithium battery. The output power supply of the discharge circuit is stable, the requirement of general master control or stable voltage input of the circuit is met, the circuit has universality, and the circuit is more suitable for replacing general short-time power failure protection equipment, so that the discharge circuit has more advantages in cost and performance.
In the prior art, the application of the super capacitor as a backup power supply has no management on charging and discharging, has no stable output of a discharging circuit, has no maximum utilization of the capacity of the super capacitor, lacks a shutdown function, has no universal universality for realizing the application requirement of the circuit, and has no function of resetting the power on after the power failure of hardware; the present invention undoubtedly has a remarkable effect.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of a second switch of the present invention;
FIG. 3 is a control module enable control schematic of the present invention;
FIG. 4 is a schematic circuit diagram of the present invention;
fig. 5 is a schematic circuit diagram of the main control module according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the following examples, which are intended to be illustrative, but not limiting, of the invention.
Referring to fig. 1 to 5, a general short-time backup power circuit includes a first switch, a charging circuit, an energy storage device, a second switch, a discharging circuit, and a main control module;
the power supply is connected with a charging circuit through a first switch, and the charging circuit is connected with the energy storage device; the energy storage device is connected with the charging circuit through a second switch; the first switch is also connected with the discharge circuit through a power supply bypass; the discharge circuit supplies power to the electric equipment and the main control module;
the first switch and the second switch are mutually exclusive switches; when the power supply supplies power normally, the first switch is switched on, and the second switch is switched off; when the power supply is powered down, the first switch is turned off, and the second switch is turned on;
the input signals received by the main control module comprise power failure detection signals and voltage detection signals of the energy storage device, and the signal output comprises charging enable for controlling the conduction of the charging circuit and discharging enable for controlling the conduction of the second switch;
the charging enable is output after a power failure detection signal pin and a voltage control pin of the energy storage device are connected with a switch through logic by a main control module; the charging enable is sent out when the power supply detects that electricity exists and the voltage of the energy storage device is lower than a threshold value, and the charging circuit is conducted to charge the energy storage device;
when the power supply is powered off, the energy storage device supplies power to the discharge circuit through the second switch, and the discharge enable keeps the second switch conducted; when the power consumption equipment is powered off, the discharging enable controls the second switch to be switched off.
The first switch comprises a path switch and a control switch, the control switch is conducted when the power supply is normal, and the path switch is conducted; the control switch is turned off when the power supply is powered off, and the path switch is turned off;
the second switch comprises a third switch and a fourth switch which are connected in series, and two sides of the third switch are also connected with a diode in parallel; the third switch and the first switch are mutually exclusive, and the fourth switch is controlled by the main control module;
the fourth switch is conducted by default, and the energy storage device can supply power to the discharge circuit through the diode at the moment of power failure of the power supply; after the third switch is conducted, the energy storage device supplies power to the discharge circuit through the third switch and the fourth switch;
the main control module controls the fourth switch to be switched on, and then the power supply can be cut off.
An RC delay circuit is arranged between the signal end of the discharge circuit and the first switch/the second switch and is also connected with the main control module through a bleeder circuit; the main control module is also conducted through the reset enabling control bleeder circuit to carry out hardware power-on reset control:
when the power failure detection signal is power, the main control module sends out reset to conduct the bleeder circuit, the level of the signal end of the discharge circuit changes, the discharge circuit is closed, and the whole circuit is powered down; after the main control module is powered off, the output reset enable is changed into a low level, the bleeder circuit is closed, after the power supply is powered on through the RC delay circuit, the level of the signal end of the discharge circuit is recovered, the discharge circuit works again, and the power supply is recovered to be normal.
The following describes each part of the present invention in detail with reference to the accompanying drawings.
Referring to fig. 1, the universal short-time backup power circuit of the present invention is composed of the following parts:
the intelligent energy-saving control circuit comprises a first switch, a second switch, a charging circuit (current limiting), a third switch, an energy storage device (super capacitor), a fourth switch, a second switch, a fifth switch, a discharging circuit (voltage boosting), a sixth switch and a main control module (a single chip microcomputer or an internet of things module).
The power source VIN comes from the first switch and then has two flow paths, one to the charging circuit and the other to the power supply bypass. The charging circuit (current limiting) charges the energy storage device (super capacitor). The power supply bypass is directly connected with the discharge circuit (voltage boosting), the voltage boosted by the discharge circuit is used as a main power supply VCC for power supply, and the VCC supplies power to the main control module and also supplies power to other circuits of the equipment. Under the condition of power failure, the energy storage device (super capacitor) can supply power to the discharge circuit through the second switch, so that normal power supply of the equipment is ensured.
The first switch and the second switch are mutually exclusive switches of hardware, so that the energy storage device (super capacitor) cannot be directly charged during charging, and only can be charged through the charging circuit when charging is needed; when the external power supply is powered off, the first switch is turned off, and the situation that the current is not reversely poured to the VIN end of the input power supply can be ensured under the condition that the second switch is turned on.
The first switch is controlled to be switched on/off by an external power supply, the first switch is switched on when the external power supply supplies power, and the first switch is switched off when the external power supply loses power.
The second switch comprises a pair of series-connected double switches, such as back-to-back switches using PMOS tubes; as shown in fig. 2, the third switch implements mutual exclusion with the first switch, and the third switch is also connected with a diode in parallel; the fourth switch is controlled by the main control module and is in a conducting state by default. Therefore, at the moment of power failure of an external power supply, the super capacitor can supply power to the discharge circuit through the diode, and the power supply of the equipment is prevented from being flashed; when the power-off operation is needed, the fourth switch is controlled to be switched off by the main control module, and the power supply can be cut off.
The charging circuit (current-limiting) is controlled by connecting an external power failure detection signal and a control pin of the main control module after hardware logic and operation, so that the charging circuit (current-limiting) can only send a charging signal to control charging enabling through the main control module under the condition that an external power supply is electrified.
The charging circuit (current limiting) is a circuit for charging the super capacitor, is provided with a charging enable switch, mainly has a current limiting function, prevents overlarge instantaneous current of an input VIN power supply, and protects the power supply of power supply voltage. Generally, a current-limiting switch is used, and the current-limiting value is the charging current of the super capacitor.
Referring to fig. 3, the charging control of the energy storage device by the master control module is as follows:
the main control module carries out power failure detection in real time and collects the voltage of the energy storage device at regular time; if the received power supply power failure detection signal is electrified and the received voltage detection signal of the energy storage device is lower than the threshold voltage, the logic and switch is conducted, the charging enable is sent out, and the switch in the charging circuit is opened to charge the energy storage device; if the detected voltage of the super capacitor is not smaller than the threshold value, the logic and switch is not conducted, and the charging circuit is closed.
The main control module controls the discharge of the energy storage device as follows:
the master control module defaults that the fourth switch is kept on;
if the received power failure detection signal is power failure, the fourth switch is kept to be conducted by discharging enable;
the main control module also implements the following power-down protection strategies after power failure:
estimating the current SOC electric quantity according to the voltage of the energy storage device, estimating the power supply time of a backup power supply by combining the current of the electric equipment, and reporting a warning, prompting and/or performing low power consumption setting to the electric equipment; when the voltage of the energy storage device is lower than the threshold value, prompting the electric equipment to prepare for power failure;
when the electric equipment is shut down, the fourth switch is closed by controlling the discharging enable, and the power supply to the discharging circuit is cut off.
Specifically, the main control module (the single chip microcomputer or the internet of things module) is responsible for collecting voltage of the energy storage device (the super capacitor) and detecting power failure (an IO port of the main control module is used as a pin for detecting a power failure signal, when an external power supply is electrified, the detection pin is high level (or low level), when the external power supply is powered down, the detection pin is opposite, so that whether the power failure occurs or not is detected by using the level, and charging management, discharging management and shutdown actions of the energy storage device are carried out according to the collected signals and the control module.
Control 1 (enable 1) performs charge control of the energy storage device (supercapacitor): when the power supply power failure signal is detected to be electrified, and the acquired voltage of the energy storage device is lower than the threshold voltage, the control 1 is enabled to charge, otherwise, the charging is not carried out; the threshold voltage does not exceed the rated voltage of the energy storage device, for example, the super capacitor is 2.7V, the threshold is 2.6V, and 0.1V is reserved for derating protection.
Control 2 (enable 2) performs discharge control of the energy storage device (supercapacitor): the power failure signal is detected as power failure, and the enable 2 controls the fourth switch to be opened and conducted; and when the fourth switch is in the initial power-on period, the default state is open and conducted, so that the backup power supply can be powered on through the second switch at the moment of power failure.
When the external power supply is detected to be powered off, the equipment has already done the task of power-off pre-processing, and meets the shutdown condition, the energy 2 is enabled to close the fourth switch, and then the power supply can be cut off.
The control 3 (enable 3) carries out power-down hardware power-up reset control again, outputs a control signal and closes a discharge circuit (boost) to enable the whole circuit to be powered down directly under the condition that the external power supply is powered down and detected to be powered; after the main control module is powered off, the output control signal is automatically changed into low level, the external power supply recharges the enabling signal through the universal RC time delay circuit and changes into high level, the discharging circuit (boosting) works again, and the power supply is recovered to be normal. The power-down duration can be configured and adjusted through the resistance value and the capacitance value of the RC; and the RC time delay circuit ensures that the discharge circuit (boosting) is enabled under the condition that the external power supply is electrified.
The RC time delay circuit ensures that the discharge circuit is enabled under the condition that the power supply is electrified, and the power supply supplies power to the electric equipment through the first switch and the discharge circuit;
the power-down duration in power-on reset can be configured and adjusted through the resistance value and the capacitance value of the RC delay circuit.
The main control module is responsible for collecting the voltage of the super capacitor, and because the voltage of the super capacitor and the SOC of the electric quantity are in a linear proportional relation, the SOC of the super capacitor can be directly estimated, so that the corresponding power consumption management and estimation of products can be carried out, and the final running time of the equipment is managed.
The following is described in four use cases:
1. normal power supply of external power supply
The external power supply supplies power to the device from VIN through the first switch and then through the discharge circuit (boost). The master control module starts to work after being electrified, collects the voltage of an energy storage device (super capacitor) and carries out power failure detection. The enabling conduction of the first switch is that the power supply is conducted by default, otherwise, the power failure is closed; the enable operation of the discharge circuit (boost) is by default a power-on enable. Therefore, the main control module can be normally started under the condition that the external power supply is electrified.
2. Super capacitor charge management
After the main control module is electrified, the main control module starts to execute charging and discharging management, calculates that the super capacitor is not full of a threshold value by detecting an external power supply power-down signal and collecting the voltage of the super capacitor, and then opens a charging circuit for charging. And continuously detecting signals, and stopping the charging circuit until the voltage of the super capacitor is higher than a threshold value.
The rated voltage specifications of the super capacitor commonly used in the market at present are 2.7V, 3V, 3.3V, 3.6V, 5.4V, 5.5V and 7.5V, and the corresponding rated capacity value is from 33mF to 470F; the charging voltage of the super capacitor is ensured not to exceed the rated voltage according to the rated voltage of the selected super capacitor, otherwise, the super capacitor is damaged.
The electric quantity formula of the super capacitor is as follows: electrical quantity = capacitance capacity voltage across the capacitor, i.e. Q = C U; the electric quantity and the voltage at two ends of the capacitor are in a linear relation, and whether the super capacitor is charged can be judged as long as the voltage of the super capacitor is detected. Therefore, the threshold value for comparison during charging is the corresponding rated voltage of the selected super capacitor. And when the voltage of the super capacitor is acquired and compared with the rated voltage, if the voltage is not less than the rated voltage, the charging is full.
The main control module detects the voltage of the super capacitor at regular time, and if the voltage is lower than a threshold value, the charging circuit is turned on again for charging. And if the voltage of the super capacitor is higher than the threshold value, the charging circuit is closed.
3. Power down of external power supply
When the external power supply VIN is powered down, the third switch is provided with the diode connected in parallel, and the fourth switch is turned on by default by the main control module, so that at the moment of power failure, the super capacitor can ensure that the power supply of the equipment keeps supplying power through the diode.
And after the main control module detects the power failure signal, the third switch is opened and conducted, and the super capacitor is ensured to supply power to the charging circuit. And then the main control module calculates and estimates the current SOC electric quantity according to the collected voltage of the super capacitor and carries out corresponding action.
The corresponding actions comprise calculation and detection of the guaranteed power supply time of the backup power supply, timely reporting of an alarm, corresponding low power consumption setting, prolonging of the service time of the backup power supply as far as possible, and providing of a corresponding power failure protection strategy.
The current electric quantity can be calculated according to the voltage of the super capacitor, and the formula of the electric quantity and the current is as follows: charge = current time, i.e., Q = I t. According to the current I (rated working current) of the equipment, the time t for which the equipment can continuously work, namely the power supply time t can be calculated. The current working state is judged to be the power-down state by detecting the power-down detection signal, and the power-down alarm can be reported; and carrying out corresponding low power consumption setting prompt and setting: for example, the main frequency of the main control module is configured to perform frequency reduction, and unnecessary peripheral functions are reduced or closed, so that the most basic equipment functions are realized by the lowest power consumption, and the service life of the backup power supply is prolonged as much as possible; in addition, before the power supply time t of the equipment is reached, setting of power failure protection is carried out, such as storage of related data and logs, and closing of read-write operation of the memory, so that bad block production and the like of the memory caused by power failure of the memory during read-write are avoided.
4. Hardware power-down re-power-on reset
When the main control module needs to execute the power-down reset action, the discharging circuit is closed through the control 3, so that the effect of closing the power supply is achieved. After the RC delay circuit, the discharging circuit is reused, and the main control module and the power supply recover normal power supply.
Under the condition of normal power supply, the function of resetting the power on of the hardware after power failure is realized, and the reliability is higher than that of the traditional software resetting.
Referring to fig. 4 and 5, a specific embodiment is given below.
The first switch comprises a PMOS transistor VT1 and an NMOS transistor VT2, and the source electrode of VT1 is connected with the positive electrode of the power supply; the positive electrode of the power supply is connected with the grid electrode of the VT2 through a voltage dividing resistor, the source electrode of the VT2 is grounded, and the drain electrode of the VT2 is connected with the grid electrode of the VT 1; the drain of the VT1 is respectively connected with the charging circuit and the discharging circuit; the VT2 is conducted when the power supply is normally powered, and the VT1 is conducted; VT2 is turned off when power is off, and VT1 is turned off;
the charging circuit is a current-limiting chip D1, the current-limiting chip D1 is connected with the first switch through a voltage-dividing resistor, and a signal end of the current-limiting chip D1 is connected to an IO pin of the main control module and receives a charging enabling signal EN _1 of the main control module;
the energy storage device is a super capacitor C1, the anode of the energy storage device is respectively connected with the output end of the charging circuit and the second switch, and the cathode of the energy storage device is grounded; the super capacitor C1 is connected with an AD acquisition pin of the main control module, so that the main control module can acquire voltage signals of the main control module;
the second switch comprises a pair of back-to-back PMOS tubes VT3 and VT 5;
the VT3 is a third switch, the source is connected with the output end of the charging circuit, the drain is connected with the drain of the VT5, the grid is connected with the PNP triode VT4 which is controlled and conducted by the power source in the reverse phase; the base electrode of the VT4 is connected with the positive electrode of the power supply through a divider resistor, the collector electrode is grounded through a resistor, and the emitter electrode is connected with the grid electrode of the VT 3; VT3 implements hardware mutual exclusion with the first switch via VT 4; a parasitic diode between the source and drain of VT3, implementing a diode in parallel with the third switch;
the VT5 is a fourth switch, the grid electrode of which is connected with the drain electrode of the NMOS tube VT6, and the source electrode is connected with the discharge circuit; the source of the VT6 is grounded, the gate is connected to the IO pin of the main control module, and the VT6 receives the discharge enable signal EN _2 sent by the active module, thereby implementing the conduction control of the main control module on the VT 5.
The discharging circuit is a DC/DC boosting chip D2, and the input end of the discharging circuit is connected with the first switch and the second switch; the delay circuit comprises a first RC delay circuit formed by a resistor R12 and a capacitor C4, and a second RC delay circuit formed by a resistor R14 and a capacitor C5; the resistor R12 and the capacitor C4 are connected between the input power supply and the ground, and the resistor R14 and the capacitor C5 are connected between the master control module and the ground;
the bleeder circuit comprises an NMOS transistor VT7 and a resistor R13, wherein the source electrode of the NMOS transistor VT7 is connected with the resistor R12 through the resistor R13 and is connected with the signal end of the D1; the resistor R13 and the NMOS tube VT7 can discharge the level of the first RC circuit, so that the enabling of the discharge circuit is controllable; the drain of the VT7 is grounded, the gate of the VT7 is connected to the resistor R14 through the resistor R15, the other end of the resistor R14 is connected to the IO pin of the main control module, and receives the reset enable signal EN _3 to control the turn-on and turn-off of the VT7, so as to control the enable or disable of the discharge circuit.
The main control module is an MCU D3 integrated with a crystal oscillator circuit inside, and a power supply part of the main control module comprises a power supply circuit and a power-on reset circuit; the power supply circuit comprises power supply filter capacitors C22 and C23 which are connected to a power supply pin of the MCU D3; the power-on reset circuit comprises a resistor R21 and a capacitor C21 which are connected to an NRST pin of the MCU D3 and form an RC circuit of the power-on reset;
the resistors R22 and R23 form a voltage division circuit for power input, are connected to a PB0 pin of the MCU D3 and are used as input signals for power failure detection of the main control module;
the resistors R24 and R25 form voltage division input of a super capacitor, are connected to a PB1 pin of the MCU D3 and are AD input signals for the master control module to collect the voltage of the energy storage device;
a PC4 pin of the MCU D3 is used as a charging enable pin and outputs a charging enable signal EN _ 1;
a PC1 pin of the MCU D3 is used as a discharge enabling pin and outputs a discharge enabling signal EN _ 2;
the pin PC0 of the MCU D3 serves as a power-down reset pin and outputs a reset enable signal EN _ 3.
Specifically, specific use examples are given below.
1: a first switch. A PMOS tube VT1 is used as a switch for conducting a power supply path; the VIN input power supply is divided by resistors R1 and R2, and then the grid of an NMOS transistor VT2 is controlled, so that the VT2 is controlled to be switched on; the drain of VT2 is connected to the gate of VT1, thereby controlling the turn-on of VT 1. The VT2 can be ensured to be conducted when the VIN power supply is normally powered; thereby turning VT1 on.
2: the charging circuit (current limiting) specifically selects a current limiting protection switch chip MT9700 of a Western-style aerospace civil core by using a current limiting chip D1, and the current limiting can be configured by a configuration resistor R6. Or, a voltage reduction type DC/DC chip which is commonly used in the market can be selected, and the current and the voltage of the charging circuit are ensured to meet the rated specification of the rear-end energy storage device. Wherein, R4 and R5 are voltage dividing resistors, and are used as an enable signal EN _1 of D1, and this enable signal is connected to the IO pin of the main control module, so as to realize the control of the main control module.
3: energy storage devices (super capacitors). C1 is an energy storage device, and the super capacitor of emerald can be selected, 100F/2.7V. Other brands and specifications may be chosen where it is critical to match the output voltage of the charging circuit to the rated voltage of the supercapacitor, otherwise the capacity of the supercapacitor cannot be used 100% because the supercapacitor is damaged or does not reach the rated voltage. The super capacitor needs to be connected to the main control module, and a signal C _ VOL is connected to an AD acquisition pin of the main control module, so that the voltage of the super capacitor can be acquired by the main control module, and the energy storage capacity of the super capacitor is obtained.
4: a second switch. A pair of back-to-back PMOS transistors, VT3 and VT5, are used as power path switches. Wherein, the VT4 is a PNP triode used for controlling the conduction of the VT 3; the VIN input power is divided by resistors R7 and R8, and the conduction of VT4 is controlled in an inverted mode, so that the conduction control of VT3 is realized. Thus, the hardware mutual exclusion function of the VIN input power supply and the second switch can be realized. In which there is a parasitic diode between the source 2 pin and the drain 3 pin of VT3, which directly implements the function of the shunt diode of the third switch. The VT6 is an NMOS tube, the control end of the grid electrode is a signal EN _2, and the signal EN _2 needs to be connected to an IO pin of the main control module to realize the control of the main control module; the drain 3 pin of the VT6 is connected to the gate of the VT5, which controls the turn-on of the VT5, thereby controlling the second switch.
5: discharge circuit (boost). D2 is a DC/DC booster chip, here HX3001 of cereal core microelectronics is selected. The resistor R12 and the capacitor C4 form an RC upper-power delay circuit; the resistor R13 and the NMOS transistor VT7 can discharge the level of the RC circuit, so that the enabling of the D2 discharge chip is controllable; a resistor R14 and a capacitor C5 form another RC power-on delay circuit; one end of the R14 is connected to an IO pin of the main control module for controlling turn-on and turn-off of the VT7, so as to control enabling or disabling of the D2.
6: and a main control module. Referring to fig. 5, D3 selects STM8L051F3 of ST semiconductor as a main control MCU, and the minimum system of the main control includes two parts of a power supply and a power-on reset circuit, wherein a crystal oscillator circuit is integrated in the MCU. Wherein the capacitors C22 and C23 are the power filter capacitors of the MCU and are connected to the power supply pin of D3. The resistor R21 and the capacitor C21 are power-on reset RC circuits and are connected to the NRST pin of D3. The resistors R22 and R23 form a voltage division circuit of external power supply input, are connected to a PB0 pin of the D3, and are used for detecting the power failure of the external power supply of the MCU. The resistors R24 and R25 are used for voltage division input of the super capacitor and are connected to a PB1 pin of D3 to be used as ADC voltage collection of the MCU for collecting the voltage of the super capacitor. A PC4 pin of D3 is used as a charging control enable pin; the PC1 pin of D3 is used as a shutdown enable pin of the whole power supply; the PC0 pin of D3 serves as a hardware power down reset function pin.
The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.
Claims (10)
1. A universal short-time backup power supply circuit is characterized by comprising a first switch, a charging circuit, an energy storage device, a second switch, a discharging circuit and a main control module;
the power supply is connected with a charging circuit through a first switch, and the charging circuit is connected with the energy storage device; the energy storage device is connected with the charging circuit through a second switch; the first switch is also connected with the discharge circuit through a power supply bypass; the discharge circuit supplies power to the electric equipment and the main control module;
the first switch and the second switch are mutually exclusive switches; when the power supply supplies power normally, the first switch is switched on, and the second switch is switched off; when the power supply is powered down, the first switch is turned off, and the second switch is turned on;
the input signals received by the main control module comprise power failure detection signals and voltage detection signals of the energy storage device, and the signal output comprises charging enable for controlling the conduction of the charging circuit and discharging enable for controlling the conduction of the second switch;
the charging enable is output after a power failure detection signal pin and a voltage control pin of the energy storage device are connected with a switch through logic by a main control module; the charging enable is sent out when the power supply detects that electricity exists and the voltage of the energy storage device is lower than a threshold value, and the charging circuit is conducted to charge the energy storage device;
when the power supply is powered off, the energy storage device supplies power to the discharge circuit through the second switch, and the discharge enable keeps the second switch conducted; when the power consumption equipment is powered off, the discharging enable controls the second switch to be switched off.
2. The universal short time backup power supply circuit as claimed in claim 1, wherein said first switch comprises a path switch and a control switch, the control switch being turned on when the power supply is normal, the path switch being turned on; the control switch is turned off when the power supply is powered off, and the path switch is turned off;
the second switch comprises a third switch and a fourth switch which are connected in series, and two sides of the third switch are also connected with a diode in parallel; the third switch and the first switch are mutually exclusive, and the fourth switch is controlled by the main control module;
the fourth switch is conducted by default, and the energy storage device can supply power to the discharge circuit through the diode at the moment of power failure of the power supply; after the third switch is conducted, the energy storage device supplies power to the discharge circuit through the third switch and the fourth switch;
the main control module controls the fourth switch to be switched on, and then the power supply can be cut off.
3. The universal short-time backup power supply circuit as claimed in claim 1 or 2, wherein the charging control of the energy storage device by the main control module is as follows:
the main control module carries out power failure detection in real time and collects the voltage of the energy storage device at regular time; if the received power supply power failure detection signal is electrified and the received voltage detection signal of the energy storage device is lower than the threshold voltage, the logic and switch is conducted, the charging enable is sent out, and the switch in the charging circuit is opened to charge the energy storage device; if the detected voltage of the super capacitor is not smaller than the threshold value, the logic and switch is not conducted, and the charging circuit is closed.
4. The universal short-time backup power supply circuit as claimed in claim 1 or 2, wherein the discharge control of the energy storage device by the main control module is as follows:
the master control module defaults that the fourth switch is kept on;
if the received power failure detection signal is power failure, the fourth switch is kept to be conducted by discharging enable;
the main control module also implements the following power-down protection strategies after power failure:
estimating the current SOC electric quantity according to the voltage of the energy storage device, estimating the power supply time of a backup power supply by combining the current of the electric equipment, and reporting a warning, prompting and/or performing low power consumption setting to the electric equipment; when the voltage of the energy storage device is lower than the threshold value, prompting the electric equipment to prepare for power failure;
when the electric equipment is shut down, the fourth switch is closed by controlling the discharging enable, and the power supply to the discharging circuit is cut off.
5. The universal short-time backup power supply circuit as claimed in claim 1, wherein an RC delay circuit is further provided between the signal terminal of the discharging circuit and the first switch/the second switch, and further connected to the main control module through the bleeding circuit; the main control module is also conducted through the reset enabling control bleeder circuit to carry out hardware power-on reset control:
when the power failure detection signal is power, the main control module sends out reset to conduct the bleeder circuit, the level of the signal end of the discharge circuit changes, the discharge circuit is closed, and the whole circuit is powered down; after the main control module is powered off, the output reset enable is changed into a low level, the bleeder circuit is closed, after the power supply is powered on through the RC delay circuit, the level of the signal end of the discharge circuit is recovered, the discharge circuit works again, and the power supply is recovered to be normal.
6. The universal short-time backup power supply circuit as claimed in claim 5, wherein said RC delay circuit ensures that the discharge circuit is enabled when the power supply is powered, and the power supply supplies power to the electric equipment through the first switch and the discharge circuit;
the power-down duration in power-on reset can be configured and adjusted through the resistance value and the capacitance value of the RC delay circuit.
7. The universal short-time backup power supply circuit as claimed in claim 1 or 2, wherein the energy storage device is a super capacitor, the main control module defaults that the fourth switch is kept on, and the third switch is connected with a diode in parallel, and at the moment of power failure, the super capacitor can supply power to the discharge circuit through the diode;
after power failure, the third switch is opened, the first switch is turned off, the main control module detects a power failure signal of the power supply, the fourth switch is kept on, and the super capacitor is ensured to supply power to the charging circuit;
the charging circuit is a current-limiting circuit or a current-limiting chip; the discharging circuit is a booster circuit or a booster chip;
the threshold voltage does not exceed the rated voltage of the energy storage device.
8. The universal short-time backup power supply circuit as claimed in claim 2, wherein said first switch comprises a PMOS transistor VT1 and an NMOS transistor VT2, wherein a VT1 source is connected to the positive power supply electrode; the positive electrode of the power supply is connected with the grid electrode of the VT2 through a voltage dividing resistor, the source electrode of the VT2 is grounded, and the drain electrode of the VT2 is connected with the grid electrode of the VT 1; the drain of the VT1 is respectively connected with the charging circuit and the discharging circuit; the VT2 is conducted when the power supply is normally powered, and the VT1 is conducted; VT2 is turned off when power is off, and VT1 is turned off;
the charging circuit is a current-limiting chip D1, the current-limiting chip D1 is connected with the first switch through a voltage-dividing resistor, and a signal end of the current-limiting chip D1 is connected to an IO pin of the main control module and receives a charging enabling signal EN _1 of the main control module;
the energy storage device is a super capacitor C1, the anode of the energy storage device is respectively connected with the output end of the charging circuit and the second switch, and the cathode of the energy storage device is grounded; the super capacitor C1 is connected with an AD acquisition pin of the main control module, so that the main control module can acquire voltage signals of the main control module;
the second switch comprises a pair of back-to-back PMOS tubes VT3 and VT 5;
the VT3 is a third switch, the source is connected with the output end of the charging circuit, the drain is connected with the drain of the VT5, the grid is connected with the PNP triode VT4 which is controlled and conducted by the power source in the reverse phase; the base electrode of the VT4 is connected with the positive electrode of the power supply through a divider resistor, the collector electrode is grounded through a resistor, and the emitter electrode is connected with the grid electrode of the VT 3; VT3 implements hardware mutual exclusion with the first switch via VT 4; a parasitic diode between the source and drain of VT3, implementing a diode in parallel with the third switch;
the VT5 is a fourth switch, the grid electrode of which is connected with the drain electrode of the NMOS tube VT6, and the source electrode is connected with the discharge circuit; the source of the VT6 is grounded, the gate is connected to the IO pin of the main control module, and the VT6 receives the discharge enable signal EN _2 sent by the active module, thereby implementing the conduction control of the main control module on the VT 5.
9. The universal short time backup power circuit as claimed in claim 5, wherein said universal short time backup power circuit is characterized in that
The discharging circuit is a DC/DC boosting chip D2, and the input end of the discharging circuit is connected with the first switch and the second switch; the delay circuit comprises a first RC delay circuit formed by a resistor R12 and a capacitor C4, and a second RC delay circuit formed by a resistor R14 and a capacitor C5; the resistor R12 and the capacitor C4 are connected between the input power supply and the ground, and the resistor R14 and the capacitor C5 are connected between the master control module and the ground;
the bleeder circuit comprises an NMOS transistor VT7 and a resistor R13, wherein the source electrode of the NMOS transistor VT7 is connected with the resistor R12 through the resistor R13 and is connected with the signal end of the D1; the resistor R13 and the NMOS tube VT7 can discharge the level of the first RC circuit, so that the enabling of the discharge circuit is controllable; the drain of the VT7 is grounded, the gate of the VT7 is connected to the resistor R14 through the resistor R15, the other end of the resistor R14 is connected to the IO pin of the main control module, and receives the reset enable signal EN _3 to control the turn-on and turn-off of the VT7, so as to control the enable or disable of the discharge circuit.
10. The universal short-time backup power supply circuit as claimed in claim 8 or 9, wherein the main control module is an MCU D3 with a crystal oscillator circuit integrated therein, and the power supply part comprises a power supply circuit and a power-on reset circuit; the power supply circuit comprises power supply filter capacitors C22 and C23 which are connected to a power supply pin of the MCU D3; the power-on reset circuit comprises a resistor R21 and a capacitor C21 which are connected to an NRST pin of the MCU D3 and form an RC circuit of the power-on reset;
the resistors R22 and R23 form a voltage division circuit for power input, are connected to a PB0 pin of the MCU D3 and are used as input signals for power failure detection of the main control module;
the resistors R24 and R25 form voltage division input of a super capacitor, are connected to a PB1 pin of the MCU D3 and are AD input signals for the master control module to collect the voltage of the energy storage device;
a PC4 pin of the MCU D3 is used as a charging enable pin and outputs a charging enable signal EN _ 1;
a PC1 pin of the MCU D3 is used as a discharge enabling pin and outputs a discharge enabling signal EN _ 2;
the pin PC0 of the MCU D3 serves as a power-down reset pin and outputs a reset enable signal EN _ 3.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116207982A (en) * | 2023-04-25 | 2023-06-02 | 北京理工大学 | Capacitor charging and releasing device with redundant design |
| CN117691732A (en) * | 2024-02-04 | 2024-03-12 | 安瑞科(廊坊)能源装备集成有限公司 | Hydrogen additional control circuit and control method |
| CN117811364A (en) * | 2024-03-01 | 2024-04-02 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
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2021
- 2021-07-30 CN CN202110871290.7A patent/CN113890167A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116207982A (en) * | 2023-04-25 | 2023-06-02 | 北京理工大学 | Capacitor charging and releasing device with redundant design |
| CN117691732A (en) * | 2024-02-04 | 2024-03-12 | 安瑞科(廊坊)能源装备集成有限公司 | Hydrogen additional control circuit and control method |
| CN117691732B (en) * | 2024-02-04 | 2024-05-07 | 安瑞科(廊坊)能源装备集成有限公司 | Hydrogen additional control circuit and control method |
| CN117811364A (en) * | 2024-03-01 | 2024-04-02 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
| CN117811364B (en) * | 2024-03-01 | 2024-06-11 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
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